I think this is a terrible idea, for the privacy reasons, because of the cost of implementation, the temptation to game the system, and because gas taxes are (imnsho) a good enough proxy for usage. Gas taxes also encourage fuel efficiency by raising the cost of gas. Sure, when everyone is driving electric vehicles, the tax structure will have to change.
Is there some divine requirement that taxes be based upon usage? People without children don't pay lower taxes than those who do have children, even though the latter (probably) makes use of the public education system. Same deal for any number of public services. In fact, the biggest argument to me for the gas tax is more to encourage fuel efficiency than anything else - burning gasoline has an environmental impact that effects everyone. Taxation helps to increase the cost of burning gas, and thus discourage use.
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